Thread-controlling device for sewing-machines.



No. 822,337. PATENTED JUNE 5, 1906.

. O. V. BAUER.

THREAD CONTROLLING DEVICE FOR SEWING MACHINES.

APPLIOATION FILED JUNE 17. 1903.

RG2- Fla--31 F e-4-- Fuel @ J3 J NVENTOR ATTORNEY.

muRLw a. sumw co. Pnam-Lwriomnwns. vnsvvmamk. n cy UNITED STATES PATENTQFFIGE.

CHARLES v BAUER, OF LOUISVILLE, KENTUCKY, ASSIGNOR To THE BAUER MACHINECOMPANY, A CORPORATION.

Specification of Letters Patent.

Patented June 5, 1906.

Application filed June 17,1903. Serial No. 161,898.

1'0 ctZZ whmn it may concern.-

Be it known that 1, CHARLES V. BAUER,a citizen of the United States,residing at Louisville, in the county of Jefferson and State ofKentucky, have invented certain new and useful Improvements inThread-Controlling Devices for Sewing-Machines, of which the followingis a specification, reference being had therein to the accompanyingdrawings.

The object of my invention is to overcome a common objection existing insewing-machines of this class, which is the occasional failure of theshuttle to pass through the loop made by the thread of the needle,thereby failing to make a lock-stitch. The cause of this failure and themethod of overcoming it is illustrated in Figures 2, 3, and 4, in eachof which views W is the material to be sewed, N is the needle of themachine, T is the thread passing through the needle. Hereinafter in thisspecification the thread having been used in the material to be sewed upto the eye of the needle will be referred to as the thread on the backside of the needle. The portion of the thread from the eye of the needleto the spool will be referred to as the thread on the front side of theneedle.

Fig. 1 is a-front view of the upper head of a sewing-machine with theneedle-bar A and my device for taking up the superfluous loop.

Fig. 1 is a top view of the striker-arm. Fig.

2 shows the relative position of the needle and thread to the work atthe extreme downward throw of the needle. Fig. 3 shows the relativeposition of the needle and thread to the work after the needle has beenwithdrawn sufficiently to form a loop L for the shuttle to pass throughand showing the superfluous loop K, the prevention of which is theobject of my invention. Fig. 4 shows the relative position of the needleand thread to the work after the needle has been withdrawn sufficientlyto form a loop for the shuttle to pass through and showing the thread onthe front side of the needle taken up to avoid the formation of thesuperfluous loop K. Fig. 5 is a side View showing the thread-clampdisengaged from the striker-arm and out of contact with the thread.

This loop K frequently becomes thrown over so as to interfere with theloop L and either throws it out of position or becomes twisted in such amanner that the shuttle fails to pass through the loop L, and the needlein its upward passage takes both loops through the work, thereby causinga failure in the stitch.

It can be seen that the loop K is formed by the upper portion of thethread remaining stationary in the work while the needle is withdrawingfrom the work, the surplus thread carried through by the needle assuminga position to form the loop K.

It is the object of my invention to overcome the .formation of thissuperfluous loop K, and thereby avoid the cause of failure to properlyform a lock-stitch. This I accomplish by mechanism hereinafterdescribed, the same causing the thread on the forward side of the needleto be withdrawn with the needle during a determined portion of the upward movement of the needle and to be re leased at a desired point.

In Fig. 1, A is the reciprocating bar of the sewing-machine operatingthe needle, which is attached to said bar by suitable means. E E arelugs attached to the bar A and havin eyes or holes through them throughwhich the thread passes. C is a clamp or spring plate extending betweenthe lugs E E and beneath which the thread passes. S is the screw, bymeans of which the clamp C is attached to the bar A. M is an extensionof the clamp C, bent slightly at an incline or beveled to allow thestriker-arm B to slide upon and press the clamp C against the needle-barA. B is a striker-arm adjustably attached to the stationary head of themachine in which the reciprocating bar A operates. D is a screwattaching the striker-arm B to the stationary head of the machine and bymeans of which the striker-arm may be adjusted to different positionsand held rigid after being adjusted. The upper end of the arm is formedas a loop having parallel sides, and the clamp-screw D passes throughthe same. The other or free end of said arm is bent inward (see Fig. 1and bears and is adapted to slide upon the clamp c, transversely thereofat the middle point, where 1 the clamp is broadened by its downward eX-tension. F is the eye of the needle.

In Fig. 1 the needle-bar A is shown in a po sition at the end of thedownward stroke. The clamp 0 having passed under the striker-arm B andbeing pressed close to the bar A therebetween the lugs E E firmlyagainst the bar by holds or clamps that portion of the thread A. Whenthe bar A begins its return or upward movement, that portion of thethread between the clamp C and the needle-eye F will move with the bar Aand the needle so long as the clam G continues to hold the thread andwill t ereby take up the thread usually allowed to form the loop K, Fig.3. As the bar A passes upward, carrying with it the attached clamp C, itwithdraws the clamp C from under, and thus out of contact with, thestriker-arm B, and when the clamp C has passed from beneath the arm Bits hold upon the thread is released, and the thread may pass freelythrough the eyes E. The bar A remains at rest while the shuttle ispassing through the loop formed by the slack of the thread. The clamp C,lu M, and striker-bar B are so shaped relative y to each other as toaccomplish the results described.

What I claim as my invention, and desire to secure by Letters Patent, is

, 1. The combination, with the stationary head of the sewing-machine, ofthe strikerarm having one end formed as an elongated loop, ,aclamp-screw passing through the loop and serving to support the arm inany required adjustment, the thread-clamp C, secured at one end of thereciprocating needlebar, and guides between which its free end projects,the free end of said striker-arm pressing upon the thread-clamp andadapted to slide on or off the same, substantially as described.

2. In a sewing-machine the combination of a needle-bar, means forholding and guiding the same which leaves exposed a portion of the faceof the needle-bar, a spring threadclamp secured to the needle-bar andhaving its spring action away from the bar and away from the thread,means for guidin the thread between the face of the need e-bar andthefree portion of the clamp, and a striker-arm attached to the frame ofthe machine and having its end constructed and arranged in the path ofthe clamp to force the same periodically against the thread as theneedlebar descends, substantially as and for the purposes described.

3. In a sewing-machine the combination of a needle-bar, means forholding and guiding the same arranged to leave exposed a portion of theface of the needle-bar, a spring thread-clamp secured to the needle-barand having its spring action away from the bar and away from the thread,means for guiding the thread between the face of the bar and the freeportion of the clamp, and a strikerarm attached to the frame of themachine and having its end constructed and arranged in the path of theclamp to force the same periodically against the thread as the needlebardescends, the striker-arm having its operative end vertically adjustablealong the path of the clamp, substantially as and for the purposesdescribed.

4. In a sewing-machine the combination of a needle-bar, means forholding and guiding the same, a spring thread-clamp secured to theneedle-bar and having its spring action away from the needle-bar andaway from the thread, means for guiding the thread under the freeportion of the clamp, and a strikerarm attached to the frame of themachine and having a portion which is constructed and arranged in thepath of the clamp to force the same periodically a ainst the thread tohold the latter, substantia ly as and for the purpose described.

In testimony whereof I affiX my signature in presence of two witnesses.

CHARLES V. BAUER. Witnesses:

C. H. SHEILD, J. B. MCCORMICK.

